Ricoh M049 Service Training page 35

q Transfer roller touches OPC drum surface. Constant current is applied to
transfer roller from power supply unit board. Positively-biased transfer
roller pulls negatively-charged toner off drum. Curvature of drum, and
antistatic brush, help paper to separate from drum.
q If a paper jam occurs during printing, toner may be transferred to the
transfer roller surface. To prevent toner from transferring to the
underside of the paper, the transfer roller must be cleaned before the
next print job.
q While the machine is in the cleaning mode, the Power Supply Unit board
applies a negative voltage to the transfer roller. The negatively charged
toner on the transfer roller is then transferred back to the drum.
q The machine goes through the cleaning mode at the following times.
w At power-up: The process starts when the fusing temperature reaches the
standby temperature.
w When the cover is opened and then closed during the printing process.
w After a printer jam has been cleared.
Slide 35
For more details, see the service manual.
Transfer & Separation
35
M049 (MF-2a) / M048 (MF-2b)